add help for selecting waveforms

documentation/05 _ Select Waveforms.help.md

+<img alt="Whole Section" src="images/select_waveform/whole_section.png" width="250" />
+<br />
+
+# Selecting Waveforms
+
+---------------------------
+---------------------------
+
+## Selecting all waveform channels
+Check the checkbox "All Waveform Channels"
+<br />
+<img alt="Select all waveform channels" src="images/select_waveform/check_all_waveform_channels.png" height="40" />
+<br />
+
+## Selecting no waveform channels
+Unchecked the checkbox "All Waveform Channels", unchecked all "DSs" checkboxes, clear textbox "MSeed Wildcards".
+<br />
+<img alt="Select no waveform channels" src="images/select_waveform/check_none_waveform_channels.png" width="250" />
+<br />
+
+## Selecting data streams for Reftek
+Check some of "DSs" checkboxes with the index corresponding to the data streams you want to select.
+<br />
+<img alt="Select data streams" src="images/select_waveform/select_data_stream.png" width="250" />
+<br />
+If some "DSs" are checked, but data type isn't Reftek and either TPS or RAW are checked, a warning will be created, "Checked data streams will be ignored for none-RT130 data type."
+
+## Selecting mseed's waveform
+User can add different wildcards separated with commas to MSeed Wildcard textbox.
+For example: \*, LH*, L*1. 
+<br />
+<img alt="Select data streams" src="images/select_waveform/mseed_wildcards.png" width="250" />
+<br />
+If some wildcard are added, but data type is Reftek and either TPS or RAW are checked, a warning will be created, "Checked data streams will be ignored for RT130 data type."
+
+## Displaying waveform channels
+If one of TPS or RAW checkboxes aren't checked which means no data need to be displayed, all the waveform selected will be ignored.
+
+To display waveform channels, user need to check:
++ <img alt="TPS" src="images/select_waveform/select_TPS.png" height="30" />: to diplay Time-Power-Squared of the selected waveform data 
++ <img alt="RAW" src="images/select_waveform/select_RAW.png" height="30" />: and check RAW to display the actual selected waveform data.
+<br />
\ No newline at end of file